CN204304800U - A kind of alternating current-direct current mixing laminated bus for IGBT valve - Google Patents

Abstract

The utility model relates to an AC-DC hybrid laminated busbar for IGBT valves. The IGBT valve comprises IGBTs (1), radiators (2), DC capacitors (3), laminated busbars (4) and AC busbars (5) ; The IGBT (1) is installed on the radiator (2), and the IGBT (1) and the DC capacitor (3) are connected through the laminated busbar (4); the AC busbar (5) short-circuits the upper and lower two IGBTs (1) to form its AC Output; the AC-DC hybrid laminated busbar is composed of the AC busbar (5) and the laminated busbar (4) on the DC side through insulating films. The AC-DC hybrid laminated bus bar provided by the utility model is used to complete the electrical connection between the power circuit (IGBT) and the DC capacitor, and the distributed inductance is reduced through the structure of positive and negative laminated parallel distribution, thereby reducing the reverse peak voltage at both ends of the power unit. Reduce the requirements of the power device for the voltage protection absorption circuit, improve the reliability and stability of the power device operation, and improve the integration of the circuit at the same time, which is convenient for repair and maintenance.

Description

An AC-DC hybrid laminated busbar for IGBT valves

technical field

The utility model relates to an IGBT valve in the technical field of electric power electronics, in particular to an AC-DC hybrid laminated busbar for the IGBT valve.

Background technique

The IGBT valve is an actuator that uses power electronic devices such as IGBT as switches. It is an intelligent unit that integrates power circuits, protection circuits, control circuits, self-diagnosis circuits and power electronic devices. The building block combination of series or parallel connection between units can form a variety of power electronic devices for different purposes.

In power electronic devices, the unit IGBT mainly works in the switching state, and the DC capacitor works in the charging and discharging state, and the current continuously flows through the DC bus when the capacitor is charging and discharging. The inductance of the DC bus itself will affect the charging and discharging of the capacitor. When the AC bus bar connecting the upper and lower IGBTs is used in parallel with multiple IGBTs, the uneven distribution of the current will cause uneven distribution of the thermal field on the device, and the IGBTs in some positions will be easily damaged due to overheating.

Utility model content

In view of the deficiencies in the prior art, the purpose of this utility model is to provide an AC-DC hybrid laminated busbar for IGBT valves, which is used to complete the connection between the power circuit (IGBT) and the device (DC capacitor). Electrical connection, reduce the distributed inductance through the positive and negative lamination parallel distribution structure, thereby reducing the reverse peak voltage at both ends of the power unit, reducing the requirements of the power device for the voltage protection absorption circuit, making the current distribution more uniform through the AC bus, and improving the power of the power device. The reliability and stability of the operation, while improving the integration of the circuit, is convenient for repair and maintenance.

The purpose of this utility model is to adopt following technical scheme to realize:

The utility model provides an AC-DC hybrid laminated busbar for IGBT valves. The IGBT valve includes an IGBT 1, a radiator 2, a DC capacitor 3, a laminated busbar 4 and an AC busbar 5; On the device 2, the IGBT1 and the DC capacitor 3 are connected by a laminated bus 4; the AC bus 5 is connected with the upper and lower two IGBTs 1 to form its AC output; the improvement is that the AC-DC hybrid laminated bus is composed of an AC The busbar 5, the insulating film and the laminated busbar 4 on the DC side are pressed together.

Further, the IGBT valve includes a protection absorption and control unit 6, a power supply assembly 7, and a mechanical housing 8; the mechanical housing 8 includes a top surface, a bottom surface arranged in parallel, and a support rod vertically arranged between the top surface and the bottom surface The size of the top surface is smaller than the size of the bottom surface; the radiator 2 and the AC busbar 5 are installed on the bottom surface of the mechanical casing 8, and the protection absorption and control unit 6 and the power supply assembly 7 are installed on the top surface of the mechanical casing 8 ; The DC capacitor 3 is vertically arranged on the bottom surface of the mechanical casing 8 and is higher than the top surface of the mechanical casing 8 .

Further, the power supply assembly 7 supplies power to devices in the IGBT valve.

Further, the laminated busbar 4 includes a positive DC busbar and a negative DC busbar;

Combining the laminated bus bar 4 and the AC bus bar 5 into one, it has the function of the laminated bus bar 4 to complete the electrical connection between the IGBT 1 and the DC capacitor 3, and has the function of connecting the upper and lower IGBTs to form an AC output; the positive DC bus bar and the The negative DC bus bar and the AC bus bar 5 are distributed in parallel, the positive DC bus bar is located between the negative DC bus bar and the AC side bus bar, and the AC bus bar 5, the positive DC bus bar and the negative DC bus bar are crimped into one body through an insulating film.

Further, there is a round hole on the AC bus 5 in the AC-DC hybrid laminated bus, and the size of the round hole is calculated according to the strength of the electromagnetic field on the AC side; the round hole makes the current evenly distributed on the AC bus 5, avoiding the occurrence of AC The phenomenon that the local current of the busbar 5 is concentrated and heated.

Compared with the prior art, the beneficial effects achieved by the utility model are:

1. The integrated AC side busbar and DC side busbar are more reliable and convenient to install;

2. The stray inductance is lower due to the parallel distribution of the positive and negative stacks of the DC side bus;

3. The original AC bus increases the surface area, which better increases the heat dissipation;

4. Since the AC side is enclosed in the insulating film, electromagnetic interference can be better reduced;

5. The AC-DC hybrid laminated bus bar provided by the utility model is used to complete the electrical connection between the power circuit (IGBT) and the device (DC capacitor), and the distributed inductance is reduced through the positive and negative laminated parallel distribution structure, thereby reducing the power unit. The reverse peak voltage reduces the requirements of the power device on the voltage protection absorption circuit, improves the reliability and stability of the power device operation, and at the same time improves the integration of the circuit, which is convenient for repair and maintenance.

6. When multiple IGBTs are connected in parallel, the current distribution on the AC side is more uniform, ensuring that each IGBT works in the same state.

Description of drawings

Fig. 1 is the top view of the IGBT valve provided by the utility model;

Fig. 2 is a side view of the IGBT valve provided by the utility model;

Fig. 3 is a schematic diagram of the AC busbar provided by the utility model;

Fig. 4 is a structural diagram of the AC-DC hybrid laminated busbar provided by the utility model;

Among them: 1-IGBT, 2-radiator, 3-DC capacitor, 4-laminated busbar, 5-AC busbar, 6-protection absorption and control unit, 7-power supply component, 8-mechanical shell, 41-positive DC busbar , 42-negative DC bus, 9-insulation film.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

The top view of the IGBT valve provided by the utility model is shown in Figure 1. The IGBT valve is usually composed of an IGBT 1, a radiator 2, a DC capacitor 3, a laminated bus 4, an AC bus 5, a protection absorption and control unit 6, a power supply assembly 7, Mechanical shell 8 forms. The IGBT 1 is installed on the radiator 2, and connected with the DC capacitor 3 through the stacked bus bar 4, as shown in FIG. 2 . The AC bus 5 short-circuits the upper and lower two IGBTs to form its AC output, and its appearance is shown in Figure 3 .

The mechanical housing 8 includes a top surface arranged in parallel, a bottom surface, and a support rod vertically arranged between the top surface and the bottom surface; the size of the top surface is smaller than the size of the bottom surface; the radiator 2 and the AC busbar 5 are installed on On the bottom surface of the mechanical casing 8, the protection absorption and control unit 6 and the power supply assembly 7 are installed on the top surface of the mechanical casing 8; the DC capacitor 3 is vertically arranged on the bottom surface of the mechanical casing 8 and is higher than the mechanical The top surface of the shell 8. The power supply component 7 is used to supply power to devices in the IGBT valve.

The structural diagram of the AC-DC hybrid laminated busbar provided by the utility model is shown in Figure 4. The laminated busbar 4 and the AC busbar 5 form an AC-DC hybrid laminated busbar. The laminated busbar is formed by pressing the insulating film 9 to form an integrated AC and DC hybrid laminated busbar. Specifically: the laminated bus bar 4 includes a positive DC bus bar 41 and a negative DC bus bar 42; the laminated bus bar 4 and the AC bus bar 5 are combined into one, that is, the laminated bus bar 4 is used to complete the electrical connection between the IGBT 1 and the DC capacitor 3 function, and has the function of connecting the upper and lower two IGBTs to form an AC output; the positive DC bus 41, the negative DC bus 42 and the AC bus 5 are distributed in parallel, the positive DC bus is located between the negative DC bus and the AC side bus, and the AC bus 5, The positive DC bus bar 41 and the negative DC bus bar 42 are crimped together through the insulating film 9 . The distributed inductance is reduced through the structure of positive and negative laminated parallel distribution, thereby reducing the reverse peak voltage at both ends of the power unit, reducing the requirements of the power device for the voltage protection absorption circuit, improving the reliability and stability of the power device operation, and improving the circuit at the same time The integration level is convenient for repair and maintenance.

There is a circular hole on the AC bus 5 in the AC-DC hybrid laminated bus, and the size of the circular hole is calculated according to the electromagnetic field strength of the AC side; the circular hole makes the current evenly distributed on the AC bus 5, avoiding the localization of the AC bus 5. The phenomenon of concentrated current heating.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. The implementation mode is modified or equivalently replaced, and any modification or equivalently replaced without departing from the spirit and scope of the present utility model is within the protection scope of the claims of the utility model whose application is pending.

Claims (5)

1. An AC-DC hybrid laminated busbar for IGBT valves, said IGBT valve comprising IGBTs (1), radiators (2), DC capacitors (3), laminated busbars (4) and AC busbars (5) ; The IGBT (1) is installed on the radiator (2), and the IGBT (1) is connected to the DC capacitor (3) with a stacked busbar (4); the AC busbar (5) is connected to the upper and lower two IGBTs ( 1) It constitutes its AC output; it is characterized in that the AC-DC hybrid laminated busbar is formed by laminating the AC busbar (5), insulating film and the laminated busbar (4) on the DC side. 2. The AC-DC hybrid laminated busbar according to claim 1, characterized in that, the IGBT valve comprises a protection absorption and control unit (6), a power supply assembly (7) and a mechanical casing (8); the mechanical casing (8) includes a top surface, a bottom surface arranged in parallel, and a support rod vertically arranged between the top surface and the bottom surface; the size of the top surface is smaller than the size of the bottom surface; the radiator (2) and the AC busbar (5) are installed On the bottom surface of the mechanical casing (8), the protection absorption and control unit (6) and the power supply assembly (7) are installed on the top surface of the mechanical casing (8); the DC capacitor (3) is vertically arranged on the mechanical The bottom surface of the casing (8) is higher than the top surface of the mechanical casing (8). 3. The AC/DC hybrid laminated busbar according to claim 2, characterized in that the power supply assembly (7) supplies power to devices in the IGBT valve. 4. The AC-DC hybrid laminated busbar according to claim 1, wherein the laminated busbar (4) comprises a positive DC busbar and a negative DC busbar; Combining the laminated busbar (4) and the AC busbar (5) into one, it has the function of the laminated busbar (4) to complete the electrical connection between the IGBT (1) and the DC capacitor (3), and has the ability to connect the upper and lower two The IGBT forms an AC output function; the positive DC bus bar, the negative DC bus bar and the AC bus bar (5) are distributed in parallel, the positive DC bus bar is located between the negative DC bus bar and the AC side bus bar, and the AC bus bar (5), the positive DC bus bar and the negative DC bus bar The bus bar is integrated by crimping the insulating film. 5. The AC-DC hybrid laminated busbar as claimed in claim 1, characterized in that the AC busbar (5) in the AC-DC hybrid laminated busbar has a round hole, and the size of the round hole is calculated according to the electromagnetic field strength of the AC side The circular hole makes the current evenly distributed on the AC busbar (5), avoiding the phenomenon that the local current of the AC busbar (5) is concentrated and heated.